Feeding mechanism for sewing-machines.



No. 663,399. Patented Dec. 4, I900.

J. TRIPP;

FEEDING MECHANISM FOR SEWING MACHINES.

(Application filed Dec. 2, 1897. (No Model.)

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No.'663,399. Patented Dec. 4, I900.

' J. TRIPP. FEEDING MECHANISM FOR SEWING MACHINES.

(Application filed Dec. 2, 1897.)

2 Sheets-Sheet 2.

(No Model.)

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UNlTED JAMES TRIPP, OF NEW YORK, N. Y.,

ATENT FFICE.

ASSIGNOR TO ALLEN SOI-IENCK, OF

SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 663,399. dated December 4, 1900.

Application filed December 2, 1897. Serial No. 660,528. (No model.)

To all who-1n it may concern:

Be it known that I, JAMES TRIPP,a citizen of the United States, and a resident of the city, county, and State of New York, have invent ed certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following description, taken in connection with the drawings herewith accompanying, is a specification.

This invention relates to sewing-machine feeding mechanism embodying means for reversing the throw or action of the feeding device, whereby the material being operated upon may be caused to move either forward or backward, as desired; and the invention has for its object to provide a simple and effective means for regulating the movement of the feed adjusting and reversing device when operated to change the direction of the feed, so as to insure the same length of stitch on both the forward and reverse action of the feed. This objectI secure by means of the construction and arrangement of parts embodying my invention, as hereinafter set forth in detail and pointed out in the claims.

' Referring to the drawings, Figure 1 is a perspective view of a portion of a sewingmachine, partly in section, illustratinga feeding and feed adjusting and reversing mechanism embodying my invention. Figs 2 and 3 are detail views illustrating the movement of certain of the feeding-mechanism parts under different adjustments; and Fig. cisa vertical section through a portion of the sewingmachine arm, showing the connection there with of the feed adjusting and reversing devices.

To explain in detail, a denotes the bedplate of a sewing-machine, ct the arm thereof, and b the main rotating shaft, journaled in the upper part of said arm and provided with two cams or eccentrics c and d, located thereon adjacent to its rear end.

The cam or eccentric c communicates movement to a rock-shaft 6, supported on the under side of the bed-plate through the medium of a pitman c, which connects at one end with said cam or eccentric to receive a Vertical movement therefrom and at its opposite. lower end connects with a short arm 6 of the rock shaft to operate the latter and communicate an up-and-down movement to the outer end of a second arm e located thereon adjacent to its forward end. The said arm 6 is provided with a pin or roller 6 thereon, which extends within a slot f in one end of the feedbarf, and when operated as described gives the latter its vertical movement.

The feedbarfis pivotally supported at that end opposite the end containing the slot f between two arms h h of a second rockshaft h, which is also pivotally supported on suitable bearings beneath the bed-plate. This rock-shaft h is opertaed to vibrate its said arms and give the feed-bar its horizontal movement from the cam or eccentric d on the upper driving-shaft through the medium of an intermediate lever cl, which'latter is bifurcated at its upper end to embrace the said cam or eccentric d and at its lower end connects with a short arm h of the shaft h.

A short link i is pivotally connected at one end with the lever d at 1? and at its opposite end is pivotally connected with the inner end of an adjustable pin 70, which latter extends through an elongated curved slot 0, in the wall of the arm a and is provided with'a fixed flange 7t thereon for contact with the inner side of the said wall and with a clampingnut 7t' in its outer threaded end, whereby the pin may be clamped in a stationary adjustable position. By this construction it will be obvious that when the pin is adjusted to a position at the center of the slot a at which time the link. i will be about parallel with the lever (1, the latter will be vibrated at its upper end without vertical movement and the feed will remain horizontally stationary; but as the pin is moved in the curved slot a toward either side of its center a greater or less distance the position of the arc in which the outer end of the link moves will be changed and the lever 61 be caused to receive a greater or less vertical movement accordingly,as illustrated in Figs. 2 and 3, and so operate the rock-shaft to give the feed-bar a corresponding horizontal movement.

It will be understood that as the pin 70 is moved a greater or less distance toward one side of the center of the slot a the movement of the feed in one direction will be adjusted accordingly, and as it is moved to the opposite side of the center of said slot the direction of the feed will be reversed. Now in order that the length of stitch may be the same on both the forward and reverse action of the feed I have supported a plate m in a vertically-adjustable position on the arm of the machine below the slot a by means of a clamp ing-screw m, which is tapped into the arm a and extends through an elongated slot m in the plate m, with its enlarged head engaging the outer surface of the latter. To prevent turning or lateral movement of this plate m,

I have provided the arm with a second pin or screw m having one end extending-into the slot m in said plate at a point distant from the clamping-screw and serving in combination with the latter to support and guide the plate.

A link 12, pivotally secured at one end to the arm of the machine at n and at its lower end having an opening through which the outer end of the pin it extends to be supported, is provided with a stud n adjacent toits lower movable end, with which one end of a second link 0 connects, the said link 0 at its opposite end being provided with an elongated slot 0 to receive aheaded pin m in the plate m. By this construction and arrangement of the parts the fulcrum-pin 70 may be adjusted to a position to give the desired movement to the feed, and the plate 'm is then adjusted to bring its pin m to the lower end of the slot in the link 0. It will now be obvious that when it is desired to reverse the feed the clamping-nut 70 will be first loosened and the pin is then swung to the opposite side of the center of the slot to its limit of movement, as allowed by the stop-pin in. By this means the same length of stitch may be readily secured for either direction of the feed without requiring the attention of the operator other than moving the fulcrum-pin in the proper direction until brought to a stop.

The link it might be dispensed with, if desired, and the upper end of the link 0 be connected directly with the pin 7c; but I prefer -the same, for the reason that it secures an 1. In a sewing-machine, the combination, with a feeding device and means for operating the same embodying a lever, of an adjustable fulcrnm-pin having connection with said lever, a stop device, and a link having a pivotal connection with said fulcrum-pin and a vertical sliding connection with said stop de vice, substantially as and for the purpose set forth.

2. In a sewing-machine, the combination,- with a feeding device and means for operating the same embodying a lever, of an adjustable fulcrum-pin having a link connection with said lever, a link pivotally supported at one end upon a stationary support and at its opposite end having connection with said fulcrum-pin, an adjustable stop device, and a link connecting atone end with the latter and at its opposite end connecting with said fulcrum-pin and its connected link in a manner to be movable with the same, substantially as and for the purpose set forth.

3. In a sewing-machine, the combination, with a feeding device and means for operatin g the same embodying a vertically-arranged lever, of an adjustable fulcrum-pin supported to move in a curved slot in the arm of the machine and having a link connection with said lever,'a plate supported in a verticallyadjustable position on the machine-arm and provided with a pin, a link connecting the fulcrum-pin and the pin on said adjustable plate, and means for securing the latter plate and the fulcrum-pin in an adjustable stationary position, substantially as and for the purpose set forth.

4. In a sewing-machine, the combination, with a feeding device and means for operating the same embodying a vertically-arranged lever, of an adjustable fulcrum-pin havinga link connection with said lever, a link pivotally supported at one end upon a stationary support and at its opposite end having an opening to receive one end of said fulcrumpin, an adjustable stop device, and a link connecting the latter with the said fulcrumpin-connecting link, substantially as and for the purpose set forth.

JAMES TRIPP.

Witnesses:

CHAS. F. DANE, E. STEVENS. 

